Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The hydrolysis of chlorpyrifos has been found to be independent of pH below pH 7 with a half-life of approximately 72 days in this region. At alkaline pH, hydrolysis is dependent on pH with a measured half-life for chlorpyrifos of 16 days at pH 9, 25 deg C. Under conditions encountered in the environment, where other dissipative processes act on the chemical, hydrolysis will tend to be a minor route for dissipation of the chemical.

The average aqueous photolysis half-life of chlorpyrifos under mid-summer, conditions was about 30 days and could provide a significant route of degradation for this compound in the aquatic environment. The rate of photolytic decay appeared to be first order in chlorpyrifos concentration for the Rayonet-irradiated buffered solutions of chlorpyrifos, and samples exposed to sunlight

Additional information